Which of the following is true when components forming an ideal solution are mixed?

Which of the following liquid pairs does not show contraction in volume on mixing?

$A$ non-ideal solution was prepared by mixing $30 \ mL$ chloroform and $50 \ mL$ acetone. The volume of the mixture will be

At $363 \ K,$ the vapour pressure of $A$ is $21 \ kPa$ and that of $B$ is $18 \ kPa$. One mole of $A$ and $2 \ moles$ of $B$ are mixed. Assuming that this solution is ideal,the vapour pressure of the mixture is $....... \ kPa$. (Round off to the Nearest Integer).

Which property is not found in an ideal solution?

Solution $A$ contains acetone dissolved in chloroform and solution $B$ contains acetone dissolved in carbon disulphide. The type of deviations from Raoult's law shown by solutions $A$ and $B$,respectively,are: